Create a new text file and put the full path to your development folder inside.
(e.g. C:\firebug\extension\ or ~/firebug/extension/). Windows users should retain the OS'
slash direction, and everyone should remember to include a closing slash and remove any
trailing spaces.

Save the file with Firebug ID as it's name firebug@software.joehewitt.com

Hacking on Firebug

See detailed instructions
about how to provide a patch to Firebug source.